Improve unmount error handling

unmountVolume

@@ -2,14 +2,38 @@
 
 IQN=$1
 
-if [[ -z "${IQN}" ]]; then
+if [ -z "${IQN}" ]; then
 	echo "usage: $0 TargetIQN"
         echo ""
 
 	exit
 fi
 
-umount /mnt/iSCSI_${IQN}
-rm -rf /mnt/iSCSI_${IQN}
-iscsiadm -m node -T ${IQN} -u
+FOLDER="/mnt/iSCSI_${IQN}"
+
+if [ -d "${FOLDER}" ]; then
+	umount /mnt/iSCSI_${IQN} 
+	RETURNCODE=$?
+
+	if [ "${RETURNCODE}" != "0" ]; then
+		echo "Unmount of ${FOLDER} failed"
+	else
+		echo "Unmount of ${FOLDER} succeed"
+	fi
+
+	rm -rf "${FOLDER}"
+else
+	echo "${FOLDER} doesn't exist"
+fi
+
+iscsiadm -m node -T ${IQN} -u &> /dev/null
+RETURNCODE=$?
+
+if [ "${RETURNCODE}" != "0" ]; then
+	echo "Logout of ${IQN} failed"
+else
+	echo "Logout of ${IQN} succeeded"
+fi
+
+echo ""